EP1364157B1 - Luminaire - Google Patents

Luminaire Download PDF

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Publication number
EP1364157B1
EP1364157B1 EP02710252A EP02710252A EP1364157B1 EP 1364157 B1 EP1364157 B1 EP 1364157B1 EP 02710252 A EP02710252 A EP 02710252A EP 02710252 A EP02710252 A EP 02710252A EP 1364157 B1 EP1364157 B1 EP 1364157B1
Authority
EP
European Patent Office
Prior art keywords
reflector
luminaire
lamp
symmetry
plane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02710252A
Other languages
German (de)
English (en)
Other versions
EP1364157A1 (fr
Inventor
Petrus A. J. Holten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP02710252A priority Critical patent/EP1364157B1/fr
Publication of EP1364157A1 publication Critical patent/EP1364157A1/fr
Application granted granted Critical
Publication of EP1364157B1 publication Critical patent/EP1364157B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources

Definitions

  • the invention relates to a luminaire comprising:
  • Such a luminaire is disclosed in AT-B-386 671 .
  • the known luminaire is intended for use in rooms where display screens are employed.
  • such luminaires are designed such that they do not, or hardly, emit light sideways at an angle of, for example, at least 25° with the light emission window, i.e. the so-termed screening angle, in order to make sure that annoying reflections on display screens are avoided.
  • the lamp is arranged so high in the reflector that said lamp is invisible from the screening angle and hence does not emit light in said screening angle.
  • such luminaires comprise a concave, for example parabolically curved reflector, which is formed such that also light reflected by the reflector, which light intersects the plane of symmetry of the reflector, is not emitted within the screening angle.
  • the known luminaire in accordance with said AT-B-386 671 comprises a reflector with reflector side portions having a first convex area near the light emission window.
  • the parts of the reflector that are situated near the light emission window thus do not reflect light which, upon reflection, intersects the plane of symmetry at a comparatively small angle with the light emission window; instead they only reflect light which, upon reflection at the outer edge, is emitted at comparatively large angles perpendicularly to the light emission window.
  • the transition from the convex area to the concave area of the reflector side portions, i.e. the line of inflection points, is situated, in the case of the known luminaire, at approximately half the distance from the inner edge to the light emission window. The light that is reflected near the inner edge is emitted perpendicularly to the light emission window.
  • a drawback of the known luminaire resides in that it produces a comparatively narrow-angle beam, i.e. a beam with a comparatively high luminous flux on the axis and a comparatively rapid reduction of the luminous flux at comparatively small angles with the axis, and in that, if a plurality of luminaires are necessary to illuminate a comparatively large room, the luminaires must be comparatively closely spaced in order to obtain a uniform illumination. As a result, the installation and maintenance costs of the lighting are high.
  • US-A-4,403,275 discloses a luminaire comprising a box-shaped housing without a reflector, which luminaire is designed so as to accommodate four juxtaposed, tubular lamps. A smaller luminous flux is obtained by omitting the outermost lamps from said luminaire. Light generated by the innermost lamps may be lost in corners of the housing. This loss is limited by incorporating a screen that is S-shaped in cross-section in the lamp holders intended for the outermost lamps. This luminaire emits light at a very small angle with the light emission window and hence cannot suitably be used in rooms where display screens are employed.
  • this object is achieved in that the distance from the line of inflection points to the light emission window is 0.30 to 0.40 of the distance from the outer edge to the axis of the lamp to be accommodated.
  • the light emission of the luminaire in accordance with the invention is such that comparatively much light is sent far away, through the plane of symmetry, at a comparatively small angle with the light emission window.
  • the line of inflection points of the reflector known from said AT-B-386 671 is situated much higher, namely at 0.50 of the distance between the outer edge and the axis of the lamp, which corresponds to 0.54 of the distance from the inner edge to the light emission window.
  • luminaires in accordance with the invention can be arranged comparatively far apart to obtain a uniform illumination.
  • the luminaire in accordance with the invention has the advantage that it has a comparatively high flexibility, enabling identical reflector side portions of the reflector to be positioned such that the outer edges are situated at varying distances from each other.
  • said distance can be adapted to the measurements of modular ceiling systems if the luminaire must be incorporated therein.
  • said distance can be varied between, for example, 125 and 140 mm.
  • the second area is formed, near its inner edge, so as to send the light reflected by it substantially through the plane of symmetry.
  • the light reflected at said location enlarges the luminous flux in directions enclosing an angle with the plane of symmetry, which is not the case in the known luminaire, where light reflected at this location issues to the exterior perpendicularly through the light emission window to contribute to the center of the beam.
  • a uniform illumination is thus obtained at even larger intervals between the luminaires.
  • the first area is formed such that light reflected by it near the outer edge can be reflected, on the same side of the plane of symmetry, in directions aside.
  • the light is emitted to the exterior at right angles to the light emission window so as to contribute to the center of the beam.
  • the luminaire comprises a concave area that extends as far as the inner edge, the second area has a flat zone along the inner edge.
  • the flat, essentially noncurved zone comparatively much light is sent obliquely through the plane of symmetry and the light emission window to the exterior, so that, at a uniform or substantially uniform light distribution in the beam, it is possible to employ reflector side portions having a smaller surface area of the second portion.
  • the reflector side portions can be readily manufactured by roll forming.
  • the luminaire may comprise a second, substantially identical reflector with second means for accommodating a second lamp, with means for operating the lamps to be accommodated being present between the reflector and the second reflector.
  • a particularly favorable property of the luminaire in accordance with the invention is that, as a result of the shape of the reflector side portions, which shape is also determined by the location of the line of inflection points, there is enough space between the two juxtaposed reflector side portions of a twin or multiple luminaire to accommodate, for example, a ballast or an electronic starter for discharge lamps to be accommodated.
  • the depth of the luminaire can be reduced, so that less material is necessary and, if the luminaire is to be mounted in a floating ceiling, a smaller space between said floating ceiling and the actual ceiling is sufficient.
  • the luminaire can be suspended from a ceiling. Said luminaire may be open on the upper side so as to also emit indirect light, or it may be closed. On the other hand, the luminaire may be mounted to or in a ceiling. If desired, the light emission window may be provided with lamellae extending transversely to the plane of symmetry, which lamellae serve to also create a screening angle in the longitudinal direction of the luminaire.
  • the lamellae may be flat or three-dimensional, for example with hollow, such as parabolically curved, side faces.
  • the side faces of flat lamellae may be provided with a relief pattern of, for example, sawtooth-shaped strips, to reflect incident light in a downward direction.
  • the reflector and, if present, the lamellae may be of a synthetic resin or of a metal, such as aluminum. They may be polish finished, semipolish finished or matt finished. They may alternatively be made of a lacquered material.
  • the lamellae may have parallel edges in the light emission window and, for example, straight edges within the reflector or, in a suitable case, they may have a concave edge in the light emission window and a convex edge within the reflector. Alternatively, both edges may be convex.
  • the reflector it is favorable for the reflector to be accommodated in a housing which is, for example, diffusely reflecting.
  • a housing which is, for example, diffusely reflecting.
  • an opening between the inner edges of the reflector is covered, opposite the light emission window, by the housing.
  • radiation which is diffusely reflected by the housing is uniformly added to the light beam.
  • the luminaire in accordance with the invention can particularly suitably be used to accommodate a fluorescent lamp having a diameter of, for example, approximately 26 or approximately 16 mm.
  • Embodiments of the luminaire in accordance with the invention are shown in the drawing.
  • the luminaire shown in Fig. 1 has a hollow reflector 1 with a plane of symmetry 2.
  • a light emission window 3 extends transversely to the plane of symmetry 2.
  • the reflector 1 comprises reflector side portions 10 on either side of the plane of symmetry 2.
  • the luminaire comprises means 20 in the plane of symmetry 2 enabling a tubular electric lamp L to be accommodated along the light emission window 3.
  • Said means define a position of an axis 21 of the lamp L to be accommodated in the plane of symmetry 2.
  • the means shown in the Figure are a pair of lamp holders, one of which is visible and the other extends in line therewith in front of the plane of the drawing, said pair of lamp holders being suitable to accommodate a linear fluorescent lamp.
  • the reflector side portions 10 each comprise a first area 11, which has an outer edge 12 in the light emission window 3 and extends, as a convex area, away from the light emission window, and a second, concave area 13 which joins the first, convex area 11 in a straight line of inflection points 14.
  • the second area has an inner edge 15 near the axis 21 of the lamp L to be accommodated.
  • the line of inflection points 14 is situated at a distance from the light emission window 3.
  • the reflector side portions 10 yield a lateral screening angle ⁇ of at least 25°, and 30° in the Figure shown.
  • the distance from the line of inflection points 14 to the light emission window 3 is 0.30 to 0.40 of the distance from the outer edges 12 to the axis 21 of the lamp L to be accommodated.
  • the second area 13 is formed so as to send the light reflected by said area substantially through the plane of symmetry 2.
  • the rays reflected at the edge itself are shown, which rays originate from the upper side of the lamp L, the lower side, the center and from two intermediate locations. This shows that one ray, originating from the upper side of the lamp L, is reflected substantially parallel to the plane of symmetry 2, while the other rays intersect the plane of symmetry 2.
  • the first area 11 is formed such that light reflected by it near the outer edge 12 is reflected, on the same side of the plane of symmetry 2, in directions aside.
  • the Figure shows that one ray, originating from the lower side of the lamp L, is reflected in a direction substantially parallel to the plane of symmetry, while the other rays are caused to diverge in directions aside the luminaire.
  • the reflector is accommodated in a housing 30 which is diffusely reflecting.
  • the line of inflection points 14 is at a distance of approximately 31 mm from the light emission window 3.
  • the axis 21 of the lamp L is situated at a distance of 84 mm from the outer edges 12, and hence the distance of the line of inflection points 14 is 0.37 of the distance from the axis to the outer edge.
  • the distance from the axis 21 to the outer edges 12 is 90 mm.
  • the distance of the line of inflection points 14 is 0.34 of the distance from the axis to the outer edge.
  • Fig. 2 corresponding parts are indicated by means of the same reference numeral as in Fig. 1 .
  • the second area 13 has a flat zone 16 along the inner edge 15. This zone 16 can be used very effectively to laterally reflect light through the plane of symmetry 2. By virtue thereof, a smaller dimension of the reflector side portions 10 in Fig. 2 is sufficient to create a beam distribution which is substantially identical to that shown in Fig. 1 .
  • the luminaire shown in Fig. 2 is a twin luminaire comprising a second, substantially identical reflector 1' and second means 20' for accommodating a second lamp L', with means 22 for operating the lamps L, L' to be accommodated being present between the reflector 1 and the second reflector 1'.
  • Said means 22 comprise, in the embodiment shown, two ballasts or, in a variant, a twin ballast.
  • FIG. 1 A comparison between Fig. 1 and Fig. 2 shows that the specific convex/concave shape of the reflector side portions 10 of the luminaire in accordance with the invention enables, in a multiple luminaire, to accommodate means 22 in the housing 30 between two neighboring reflector side portions 10, while said means 22 could not be accommodated in an equally high housing 30, as shown in Fig. 1 , for lack of space.
  • the line of inflection points 14 is situated at a distance of approximately 30 mm from the light emission window 3.
  • the axis 21 of the lamp L is situated at a distance of 84 mm from the outer edges 12 and, consequently, the distance of the line of inflection points 14 is 0.36 of the distance from the axis to the outer edges. If the distance between the outer edges 12 is 140 mm, then the distance from the axis 21 to the outer edges 12 is 90 mm. Thus, the distance of the line of inflection points 14 is 0.33 of the distance from the axis to the outer edge.
  • the diagram shown in Fig. 3 shows the light intensity distribution in a plane at right angles to the plane of symmetry 2.
  • the line 0.0-180.0 coincides with the plane of symmetry 2, the line 90.0-90.0- is situated in the light emission window.
  • the light intensity distribution is converted to that obtained at a luminous flux of 1000 lm.
  • the light intensity distributions of different luminaires comprising different lamps can be directly compared with each other.
  • the light intensity distributions shown in Figs. 3 and 4 relate to, respectively, the luminaire in accordance with the invention and the known luminaire provided with an aluminum high-gloss reflector having a reflection coefficient of 0.85 in a lacquered housing with a reflection coefficient of 0.88.
  • the luminous intensity at angles in the range from 30° to 35° is higher than at an angle of 0°, because, if a surface extending parallel to the light emission window is illuminated, then, at larger angles, said surface is at a larger distance than at smaller angles and hence the beam must emit more light in said direction to obtain an equal illumination intensity.
  • Fig. 3 shows that, at angles above 35°, still a considerable luminous flux is emitted as compared to the maximum values, whereas, in Fig. 3 , the luminous flux at said angles is negligible as compared to the maximum values.
  • the light intensity distribution shown in Fig. 3 is delta-shaped, while the light intensity distribution shown in Fig. 4 is drop-shaped.
  • the luminaire in accordance with the invention has a more uniform light distribution over a larger field and enables luminaires to be arranged at a larger distance from each other to uniformly illuminate a very large field.
  • the light intensity distribution of the luminaire shown in Fig. 2 is substantially equal to that shown in Fig. 3 .
  • the grid size may be maximally 1.7 times the height of suspension to make sure that uniform illumination is maintained.
  • the grid size may maximally amount to 1.4 times the height of suspension.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (4)

  1. Luminaire comprenant :
    - un réflecteur creux (1) ayant :
    - un plan de symétrie (2),
    - une fenêtre de sortie de lumière (3) qui s'étend transversalement par rapport au plan de symétrie (2) ; et
    - des parties latérales de réflecteur (10) des deux côtés du plan de symétrie (2); et
    - des moyens (20) dans le plan de symétrie (2), pour recevoir une lampe électrique tubulaire (L) le long de la fenêtre de sortie de lumière (3), lesquels moyens définissent une position d'un axe (21) de la lampe (L) à recevoir dans le plan de symétrie (2),
    lesquelles parties latérales de réflecteur (10) comprennent chacune une première zone convexe (11) avec un bord extérieur (12) dans la fenêtre de sortie de lumière (3) et une deuxième zone concave (13) qui se connecte à la première zone convexe (11) dans une ligne de points d'inflexion (14) et qui présente un bord intérieur (15) proche de l'axe (21) de la lampe (L) à recevoir, la ligne de points d'inflexion (14) étant située à une distance de la fenêtre de sortie de lumière (3), et les parties latérales de réflecteur (10) formant un angle d'écran latéral a qui est au moins égal à 25°,
    caractérisé en ce que la distance à partir de la ligne de points d'inflexion (14) jusqu'à la fenêtre de sortie de lumière (3) est de 0,30 jusqu'à 0,40 à partir de la distance du bord extérieur (12) jusqu'à l'axe (21) de la lampe (L) à recevoir,
    en ce que la première zone (11) est formée de telle façon que la lumière qui est réfléchie par elle près du bord extérieur (12) puisse être réfléchie, du même côté du plan de symétrie (2), dans des directions de côté,
    en ce que la deuxième zone (13) est formée, près de son bord intérieur (15), de manière à envoyer la lumière, qui est réfléchie par elle, sensiblement à travers le plan de symétrie (2), et
    en ce que la deuxième zone (13) comprend une zone plane (16) le long du bord intérieur (15).
  2. Luminaire selon la revendication 1, caractérisé en ce que la deuxième zone (13) est formée, près de son bord intérieur (15), de manière à envoyer la lumière, qui est réfléchie par elle, à travers le plan de symétrie (2) et, par conséquent, de manière à éviter au moins sensiblement une réflexion vers la lampe (L) à recevoir.
  3. Luminaire selon la revendication 1 ou selon la revendication 2, caractérisé en ce qu'un deuxième réflecteur sensiblement identique (1') et des deuxièmes moyens (20') pour recevoir une deuxième lampe (L') sont présents, avec des moyens (22) étant présents entre le réflecteur (1) et le deuxième réflecteur (1') afin de faire fonctionner les lampes (L, L') à recevoir.
  4. Luminaire selon la revendication 1 ou selon la revendication 2, caractérisé en ce que le réflecteur est incorporé dans un boîtier (30) qui présente une réflexion diffuse.
EP02710252A 2001-02-23 2002-02-08 Luminaire Expired - Lifetime EP1364157B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02710252A EP1364157B1 (fr) 2001-02-23 2002-02-08 Luminaire

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP01200664 2001-02-23
EP01200664 2001-02-23
PCT/IB2002/000410 WO2002066891A1 (fr) 2001-02-23 2002-02-08 Luminaire
EP02710252A EP1364157B1 (fr) 2001-02-23 2002-02-08 Luminaire

Publications (2)

Publication Number Publication Date
EP1364157A1 EP1364157A1 (fr) 2003-11-26
EP1364157B1 true EP1364157B1 (fr) 2010-05-19

Family

ID=8179925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02710252A Expired - Lifetime EP1364157B1 (fr) 2001-02-23 2002-02-08 Luminaire

Country Status (8)

Country Link
US (1) US6578983B2 (fr)
EP (1) EP1364157B1 (fr)
JP (1) JP4030431B2 (fr)
CN (1) CN1201112C (fr)
AT (1) ATE468511T1 (fr)
DE (1) DE60236409D1 (fr)
ES (1) ES2345538T3 (fr)
WO (1) WO2002066891A1 (fr)

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WO2005080860A1 (fr) * 2004-02-04 2005-09-01 Nitto Denko Corporation Dispositif d'eclairage et appareil d'irradiation de lumiere utilisant un tel dispositif et procede de production pour feuille de produit photosensible utilisant de tels dispositifs
USD538462S1 (en) 2004-04-19 2007-03-13 Orion Energy Systems Ltd. Fluorescent tube light low bay reflector
FR2909024B1 (fr) * 2006-11-23 2009-02-13 Cogema Boite a gant a enceinte etanche eclairee
US7874700B2 (en) 2007-09-19 2011-01-25 Cooper Technologies Company Heat management for a light fixture with an adjustable optical distribution
US8206009B2 (en) * 2007-09-19 2012-06-26 Cooper Technologies Company Light emitting diode lamp source
WO2009039491A1 (fr) 2007-09-21 2009-03-26 Cooper Technologies Company Dispositif d'éclairage encastré à diodes électroluminescentes
JP5396703B2 (ja) * 2007-10-09 2014-01-22 富士通セミコンダクター株式会社 熱処理装置及び方法、並びに半導体装置の製造方法
US7883236B2 (en) * 2008-02-07 2011-02-08 Lsi Industries, Inc. Light fixture and reflector assembly for same
US7887216B2 (en) 2008-03-10 2011-02-15 Cooper Technologies Company LED-based lighting system and method
US8123382B2 (en) * 2008-10-10 2012-02-28 Cooper Technologies Company Modular extruded heat sink
US20100208460A1 (en) * 2009-02-19 2010-08-19 Cooper Technologies Company Luminaire with led illumination core
WO2011004297A1 (fr) * 2009-07-08 2011-01-13 Koninklijke Philips Electronics N.V. Dispositif d'éclairage
EP2457018A4 (fr) * 2009-07-21 2014-10-15 Cooper Technologies Co Raccordement d'un module de diode électroluminescente (del) à un ensemble dissipateur thermique, un réflecteur de lumière et des circuits électriques
US8596837B1 (en) 2009-07-21 2013-12-03 Cooper Technologies Company Systems, methods, and devices providing a quick-release mechanism for a modular LED light engine
US20110032698A1 (en) * 2009-08-05 2011-02-10 U.R. Tech Corporation United reflection lights with light-emitting diode
JP5990768B2 (ja) * 2012-04-19 2016-09-14 パナソニックＩｐマネジメント株式会社 ストロボ装置
RU2563226C1 (ru) * 2014-07-29 2015-09-20 Олег Леонидович Ступников Светильник
CN104456423A (zh) * 2014-10-20 2015-03-25 深圳市极成光电有限公司 防眩反光杯
DE102015108499A1 (de) 2015-05-29 2016-12-01 Osram Opto Semiconductors Gmbh Optoelektronisches Bauelement mit einer Strahlungsquelle
US10795238B2 (en) * 2018-12-06 2020-10-06 Microsoft Technology Licensing, Llc Light reflection
US11204152B2 (en) * 2019-08-15 2021-12-21 Microsoft Technology Licensing, Llc Illumination device having reflector with concave and convex symmetrical surfaces

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WO2000005537A1 (fr) * 1998-07-23 2000-02-03 Koninklijke Philips Electronics N.V. Luminaire

Also Published As

Publication number Publication date
CN1457415A (zh) 2003-11-19
JP2004519815A (ja) 2004-07-02
ATE468511T1 (de) 2010-06-15
CN1201112C (zh) 2005-05-11
JP4030431B2 (ja) 2008-01-09
EP1364157A1 (fr) 2003-11-26
WO2002066891A1 (fr) 2002-08-29
DE60236409D1 (de) 2010-07-01
US20020141182A1 (en) 2002-10-03
US6578983B2 (en) 2003-06-17
ES2345538T3 (es) 2010-09-27

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